Elevator bolts have a square neck that resists turning when a nut is tightened or removed. The large, flat head provides a greater bearing surface for soft materials. Variants included in this assortment feature a coarse 3/8"-16 thread size. Full assortments of #46257 contain six (6) refills comprised of Hillman item numbers #4756 - #4759, #398495, and #398496.